All postcard files require Adobe InDesign. Download and install Adobe InDesign from the OIT Software Center.
Note: Download templates by right-clicking on the download link and saving the file to your computer so your browser doesn't attempt to open the file directly. Postcard templates are downloaded as a compressed zip file. To extract zip file contents, once downloaded, right-click the zip file and select "Extract All" for Windows, or double-click for Macs.